3 Pack KY-024 Linear Magnetic Hall Switches Speed Counting Sensor Module Diy Starter Kit

I bought 6 of these each one tests out perfectly. Range sensitivity is adjustable from nothing to about 2 inches. Exceeding my expectations. If you know arduino, these are very easy to program.

Many similar hall sensors are listed as linear and are not. This one is.

Works perfectly and very reliable

I tested all 3 items upon receipt. I practiced good anti-static measures when unpackaging, wiring, and testing the components. None of them provided any analog or digital response to magnetic field from small neodymium magnet placed near Hall sensor. The power LED on the unit did indicate power was being received, but the analog output did not vary with magnetic field, and the digital LED did not illuminate regardless of potentiometer setting. I inspected all solder joints with a magnifier, and none appeared to be defective. I suspect the SS49E Hall sensors may have been damaged/defective prior to assembly. However, to Amazon's credit, I received a full refund and do not have to return the defective items.

Sensors were not super accurate for testing